This paper reports the status of the JPEG Pleno standard for the light field imaging modality and discusses current activities towards future developments of the standard. Currently, three parts (Part 1: Framework, Part 2: Light field coding with Amendment 1: Profiles and levels for JPEG Pleno light field coding system and Part 3: Conformance testing) have been standardized. Part 4: Reference software is in the final approval stage before standardization. The four-dimensional nature of plenoptic data poses many challenges. The literature presents several subjective and objective assessment models for the evaluation of two-dimensional (image/video) data. As for plenoptic data this topic is still under investigation, one of the JPEG Pleno standardization activities targets the development of plenoptic image quality assessment standard. Finally, as one of the possible directions within future JPEG Pleno standardization activities, JPEG Pleno is currently exploring state-of-the-art light field coding architectures exploiting learning-based approaches to assess the potential of these coding methods in terms of compression efficiency.
Light fields can nowadays be acquired by several methods and devices in the form of light field images, which are at the core of new forms of media technologies. Many research challenges are still open in light field imaging, such as data representation formats, data compression tools, communication protocols, subjective and objective quality of experience measurement metrics and methods. This paper presents a brief overview of the current architecture of the JPEG Pleno light field coding standard under development within the JPEG committee (ISO/IEC JTC1/SC29/WG1). Thereafter, a comparative analysis between the performance of the JPEG Pleno Light Field codec under various modes and configurations and the performance of the considered anchor codecs is reported and discussed.
JPEG Pleno provides a standard framework to facilitate the capture, representation, and exchange of light field, point cloud and holographic imaging modalities. JPEG Pleno Part 2 addresses coding of light field data. Two coding modes are supported for this modality. The first mode exploits the redundancy in this 4D data by utilizing a 4D transform technique, the second mode is based on 4D prediction. Both techniques are outlined in this paper as well as the file format that encapsulates the resulting codestreams.
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